Means for clamping and filing saws.



No. 847,599. Y PATENTED MAR. 19, 1907.

' C. H. PARKS & R. S. BROWN.

MEANS FOR. CLAMPING AND FILING SAWS.

APPLICATION lFILED AUG. 9, 1905.

2 SHEETS-SHEET 1.

w 7 'af' 22 Iilunllll 1% few f/ 6 ,7/////// g l j. 4 fire/2522195 2f 3 www PATENTED MAR. 19, 1907. .y o. II. PARKS N R. s, BROWN..- MEANSIOR ULAMPING AND FILING SAWS.

AryIzIoATIoN FILED AUG. 9. ,1905.`

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UNITED sTATns rAnNT Tien.

CHARLES H. PARKS AND ROBERT S. BROWN, OF NEW BRITAIN, CON NECTI- CUT, ASSIGNORS TO THE NEW BRITAIN MACHINE COMPANY, OF NEW BRITAIN, CONNECTICUT, A CORPORATION OF CONNECTICUT.

Specification of Letters Patent.

Patented vlarch 19, i907.

Application filed August 9, 1905. Serial No. 273,448.

fo a/ZZ La7/1,0m it may concern:

provement on the type of clamp covered by Be it known that we, CHARLES H. PARKS the patent to Robert S. Brown, dated Sepand ROBERT S. BROWN, citizens of the United States, residing at New Britain, in the county of Hartford and State of Connecticut, have jointly invented certain new and useful Improvements in Means for Clamping and Filing Saws, of which the following is a specification.

This invention relates to improvements in means for clamping and filing saws.`

An object of the invention is the provision of a gage in the saw-clamp, upon the top of which the saw rests, and of means for so clamping the saw that the same may be fed along by the iile, whereby the act of feeding the saw from left to right or any interruption of said act prevents the loss of the correct position of the file, and the saw is prevented from tilting by the gage, such loss of correct position being liable to occur in the old wayl of filing when the hand of the operator becomes tired and when the operator is inexperienced in his work.

A further object of the invention is the provision of improved means for operating the movable aw of the clamp or vise.

' Other objects of the invention will be hereinafter stated.

In the accompanying drawings, Figure 1 is a perspective view of our improvement. Fig. 2 is a view in elevation of a guiding device applied to the end of the file and cooperating with the flat table of the clamp in producing precisionized contour of the teeth operated on by said file. Fig. 3 is a longitudinal vertical section of the device illustrated in Fig. 2, a portion of the file being represented in elevation. Fig. 4 is a yview in elevation of a stop-pin, hereinafter described. Fig. 5 is a transverse vertical section on line 5 5 of Fig. 1, showing the base of the clamp in section. Fig. 6 is a transverse section of the file, taken on line 6 6 of Fig. 1. Fig. 7 is a side elevation of the saw-clamp; and Fig. 8 is a front view of the saw-clamp, showing the gage in dotted lines.

Like numerals designate similar parts throughout the several views.

Referring to the drawings, the numeral 5 designates in a general way an improved saw-clamp in which the details of our invention are embodied, and said clamp is an imtember 12, 1899, No. 632,694, to which reference maybe had. This improved clamp comprises a hollow body portlon 6, open at its rear and provided with a bottom wallw 7, which rests upon a table 8 or other structure to which the clamp is to be secured. De-

pending from this hollow portion 6 is an arm or standard 9, having a right-angular projection 9', in which a clamping-screw 10 is threaded, said screw having a manipulatinghandle 10.

Designated by 12 is the movable jaw of the clamp which is normally forced inward to its work by devices hereinafter described, said jaw having a depending tailpiece 12 and the stationary jaw a rib or rojection 92 on its standard 9. This movab e jaw has a fiat clamping-surface 122 and is preferably made of structural-iron shape, as illustrated in Fig. 5.

Projecting in the construction shown rearwardly from the stationary jaw 13 of the clamp is a flat file-guiding surface or table 14, which coperates with a device secured to the end of the file and serves to guide said iile in its movement, said device also preventing the dropping of the file and causing each tooth to e sharpened in an exact predetermined manner.

For operating the movable jaw of the clamp any desired means may be employed` for instance, those set forth in the Brown patent aforesaid-but for accomplishing this 'result we prefer to employ a spring 15, which is connected at one end to a lever-arm 16, rigid with a shaft 17, (see Fig. 7,) said shaft carrying at each end an arm 18, swinging upon a rod 19,.connecting ledges 2O 20, located, respectively, on the lower end of the standard 9 and beneath the overhang of the fixed jaw 13. A rod 21 passes through the opposite ends 18 of the arms 18, and thisrod has ends 182 projecting from said arms and to which the ledges 22 at the lower'end 'of the fixed jaw and 22', beneath the overhang at the upper part of said jaw, are attached.

As will be observed, the shaft 17 and its arms 18 18. constitute aframe swinging upon the rod 19, while the movable jaw 12 has a slight oscillating motion upon the ends of the rod 21 to enable rocking movement of said ICO movable jaw to take place without binding. When the handle 162 is pushed inward, the frame, consisting of the shaft 17 and its lever 16land arms 18 18, swings around the rod 19 as a fulcrum against the tension of the spring 15, connected to lever-arm 16, and as the movable jaw swings in a comparatively long arc it is first slightly withdrawn from the fixed jaw to release the saw and then partakes of a motion substantially parallel to said fixed jaw. When pressure is removed from the handle 162, the spring 15 immediately swings the frame just described in an opposite direction until this movement is arrested by the engagement of the jaw 12 with the saw-blade, said saw-blade being thereby clamped firmly in the desired position against the jaw 13.

Lever-arm 16 is provided with an extension 16 beyond its shaft 17, said extension having at its end a handle or grasping-surface 162. At its rear extremity the spring 15 is connected to a rod 23, said rod being adjustable in a sleeve 24, having a hooked projection 24', which fits over one of the projecting side plates 25 25 of the hollow base 6, as shown in Fig. 5. A hand-nut 26, threaded upon the rod 23 and bearing against the sleeve 24, serves to actuate said rod, and thus adjust the tension of the spring 15` Frequently it is necessary to release the means for normally forcing the movable jaw against the saw, and inthe present instance this may be readily accomplished by detaching the hook or projection 24 of sleeve 24 from the.

extension 25 of the base 6. For sharpening the saw any desired means may be employed, so far as the peculiar construction of the c'la'm'p' is concerned, but for accomplishing this result there are shown a file-guide and a i'ileV of peculiar form, the latter secured at one end in said guide, and this file-guide is designated generally by the numeral 27 and comprises a chambered carrier 28, on which the clamp for the end of the file is mounted.

Designated by 2 9 is a bolt recessed in its head 29 to fit over an eccentric 30, said eccentric being secured by a pin 31 to a shaft 31, having a knurled manipulating-handle 32, by which it may be actuated to raise and lower the carrier 28 and the eccentric, being mounted at its ends in bearings of said carrier. This pin 31 projects at one end, as at 312, beyond the periphery of the eccentric, and it works in a slot in the bolt-head and serves as a stop to limit the movement of the eccentric in either direction by engaging the bottom wall of the slot in head 29. Projecting from the head 29 is a threaded stem 32,

provided with a perforation for the reception y of the round end 33 of a file 34, said file having a manipulating-handle 35.` Threaded.

upon the stem 32 is a hand-nut 36, provided at intervals in its knurled portion with a series of sockets 37 for the reception of a pin,

hereinafter described, and by which it maybe manipulated to release or tighten the clamp.

Integral with the shaft 31 are trunnions 38, upon which are journaled antifriction-wheels 39. As will be obvious, when the shaft 3]. is turned the eccentric will cause the carrier to be raised andv lowered, thereby varying the vertical relation of the carrier 39 with respect to the table on which it is operated, and thus changing the altitude of said carrier -and. its connected parts and varying the height of the file.

Preferably we provide a file 34 with slightlyrounded corners 34', (see F ig. 6,) which will prevent cracks or checks from starting in the gullets of the saw-teeth.

Designated by 40 and shown in detail in Fig. 4 is I a pin which serves to limit the motion of the file when feeding the saw. This pin is of peculiar form and is provided with a knurled head 40', with a threaded stem 40, adapted to be inserted in a corresponding seat of the table 14, and with a reduced projection 403, which is adapted to be inserted. in the sockets 37 of the nut 36. Said pin therefore serves a dual purpose, for it not only acts as a stop-pin to limit the feed movement of the file, as stated., but may also be utilized as a manipulating device for the nut 36. When this nut is loosened, the small eccentric, the hand-wheel 32 of which is provided with a socket 32 for the reception of a pin 322, may be utilized to raise and lower the file in the manner described, and. thus adapt it to cooperate with saw-teeth gullets which vary in height from the face of the clamping-jaws. Furthermore, by adjusting this eccentric files of various sizes may be employed for saw-teeth differing in pitch. rl`hese sawteeth will naturally demand Vliner or coarstu files and the differences of measurement between the center of the lile and its lowest point indicate the depth of the gullet of the tooth. By adjusting this eccentric partial variations in the center of the lile due to the rotation of the same to gain a difference' in the hook of the teeth may be readily accommodated. This single knurled nut 36 serves both to clamp the file and the eccentric by forcing said eccentric against the bearings of the carrier in which it is joui'- naled, a slight space being left between the top of the bolt-head and the underside of the carrier to permit sufficient vertical movement to enable this result to be accomplished, and as the trunnions 38 constitute the ends of the shaft 31 of said eccentric the height of the roller-centers may thus be readilyregulated. Then the knurled nut has been released, the file may be readily withdrawn from the opening in the stem 32, or by means of the knurled hand-grasp 32 at the left of the shaft 31 the eccentric may be rotated and the center of height of the Afile varied, as conditions may require.

Designated by 41 is a common form of gage adjustably supported by the fixed jaw of the clamp and consisting in the present case of a iiat plate 42, having a straight longitudinal upper edge disposed in parallelism with the upper edges of the clamping-jaws and upon which the back of the saw may rest. This gage is adjustable and is provided with an oblique face 43, in which an inclined slot 44 is formed. A binding-screw 45 passes through the slot of the gage and serves to hold the same in a fixed position when it has been adjusted. To chang-e the position of this gage the binding-screw is loosened, and the gage, can then be moved either up or down, and when properly adjusted said screw is tightened to hold the gage firmly in place. In feeding the saw this gage is oi great importance, for it prevents the tilting of said saw when it is advanced by the file.

A washer 47, having a semicircular groove 47', is slipped over the stem 32 and clamps the end of the file against the similarlygrooved top of the carrier 28.

In the operation of our improvements a saw (designated by 46 and shown as of the band-saw variety, although the invention is i limited to no particular kind of saw) is placed between the jaws of the clamp-rests upon the gage 41 and is held with sufficient iirmness in position by the spring 15 and connections described to retain the saw in place for the iiling operation. To manipulate the movable jaw of the clamp, the lever 16 is operated, and this, through the lever-arms 18, will open said jaw to enable the saw-blade to be'placed in position on the gage 41, and after said lever is released the spring 15 immediately closes said movable jaw upon said saw-blade. A iile of the proper kind having been selected, the rounded or otherwise shaped end of said ile is clamped in position in the manner described and then by reciprocating the file transversely of the clamp the teeth are sharpened. When the teeth within the capacity of the clamp have been sharpened,it is necessary to feed the saw, and this is readily accomplished by the file, which is moved from left to right until it abuts against the stoppin 40 in the manner above stated, tilting of the saw being prevented by the gage, as stated. In this feeding operation pressure is applied to the top of the nut 37 by the 'left hand, thus holding the wheels 39 upon the table, when by grasping the handle 35 the iile in engagement with a saw-tooth may be moved from left to right untilit abuts against the stop-pin 40. In this operation the wheels 39 serve as a rolling ulcrum upon which the iile guide or carrier is mounted, said wheels traveling in an arcuate path over the part of the table upon which the guide is located during the feeding operation. By holding the movable jaw against the ixed jaw in the manner described the saw is clamped with yielding pressure and the saw may be readily advanced longitudinally of the clamp without opening the jaws thereof. By employing a lile-guide and flat table or guiding-surface in the manner described, projecting from one of the jaws, the iile is caused to move in practically a horizontal line and no dip or dropping of the same is permitted.

Many changes may be made in the construction of our device and still be within the purview of the invention, and said invention is not limited to any particular style of ileguide nor to the use of any speciii'c form of iile. Furthermore, the stop-pin 40 may be made adjustable as regards the width of the table 14, to thus limit the amount of feed, and the iile may be guided and the saw clamped by various devices different from those shown and described without departure from the invention.

Having thus described our invention, what we claim is- 1. The combination, with a saw-clamp, of a guiding-surface projecting from one of the jaws thereof; and a stop upon the guidingsurface, said stop serving to limit the movement of a saw-feeding device.

2. The combination, with clamping-jaws, one of which acts with yielding pressure, of a table projecting from one of said jaws g' a gage between said jaws g and a stop upon the table Jfor limiting the movement oi a sawfeeding device.

3. A saw-clamp comprising a ixed jaw 5 a movable jaw; a pivoted lever devices connecting the lever and said jaws; a spring attached to the lever, and serving to actuate said lever in one direction; and a rod to which the spring is also attached, said rod being removably mounted on the frame of one of the jaws.

4. A saw-clamp comprising a fixed jaw; a movable jaw; a device connecting the movable and the fixed jaws; means whereby said device may be actuated a spring connected to said means a sleeve having a device by which it is-removably attached to the frame 'of one of the jaws; a rod in said sleeve, said rod being connected with the spring; and means for adjusting said rod to vary the tension of said spring.

5. The combination, with iixed and movable jaws, of a movable device arms rigid with said device, and connecting the jaws; a lever rigid with the device, a spring connected to one end of said lever; a sleeve detachably connected to the frame oi' one of the jaws; a screw-threaded rod inv said sleeve, and to which one end of the spring is attached and a nut for adjusting said rod.

6. The combination, with a frame having a projecting side plate, and carrying a iixed jaw, of a sleeve having a projection hooked over said projecting side plate; a rod in said sleeve; means for adjusting said rod; a

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spring connected to the rod; a pivoted lever also connected to the spring; a movable jaw and means operated by said pivoted lever for actuating said movable jaw.

7. A saw-clamp comprising a fixed jaw; a movable jaw a pivoted lever 5 devices connecting the lever and said jaws 5 a spring attached directly to the lever, and serving to actuate said lever in one direction; a device to which the spring is also attached, said device being removably mounted on the frame of one of the jaws; and means for adjusting said device to alter the tension of the spring.

S. The combination, with iixed and mov able jaws, of a frame comprising a shaft having a pair of arms rigid therewith, and projecting from opposite sides thereof, a rod connected to the frame of the 'lixed jaw, and upon which the inner ends of said arms are fulcrumed; a rod passing through the other ends of said arms, and entering parts of the movable jaw; a spring connected to the shaft, and serving to cause the same to close the movable jaw 5 and a device removably connected to the frame of the iixed jaw for regulating the tension of the spring.

In testimony whereof we al'IX our signatures in presence of two witnesses.

CHARLES H. PARKS. ROBERT S. BROWN.

litnesses R. ANDERSON, S. S. GROTTA. 

